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Reusing the L19's

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YZFR1

10+ Year Contributor
533
53
Apr 8, 2010
Atlanta, Georgia
Hello,

i was wondering if there was any particular limit to how many times i can reuse the l19's or do they even go bad at all?

Also, if i wanted to check them in spec, would i just use the haynes manual specs or do they have thier own?

I tried searching some info but couldn't find anything detailed. Thank you

Best regards!

Edit: i was talking about not just the head bolts but also the main and rod bolts
 
Hello,

i was wondering if there was any particular limit to how many times i can reuse the l19's or do they even go bad at all?

Also, if i wanted to check them in spec, would i just use the haynes manual specs or do they have thier own?

I tried searching some info but couldn't find anything detailed. Thank you

Best regards!

Edit: i was talking about not just the head bolts but also the main and rod bolts
you take a standing non streched measurement..and keep a log of how far they have streched after each use.... there should be a log sheet that came with your studs.
 
Last edited by a moderator:
you take a standing non streched measurement..and keep a log of how far they have streched after each use.... there should be a log sheet that came with your studs.

This is the best way to make sure they are reusable. You'd have had to measure the length of the studs/bolts individually when new and write it down. When you go to reuse them, you need to measure them again and compare them to the value when they were new. If they stretched, they have yielded and you shouldn't reuse them.

But, most don't bother measuring them. ^^ is right when he says if they haven't been torqued above specifications, they should be reusable.
 
Thanks so much guys!!

They are for a 6 bolt and i did not get a chance to measure them before because i got them as a bonus with a car that came with a blown up 2.34L stroker.

It's a good thing i haven't really cleaned them up yet, still oily and i will be keeping them this way until ready to use :)

I got the whole arsenal of measuring tools now, so i'm measuring everything, including the studs!
 
Paul, what would the three steps be? 30-60-105?
 
Don't forget that L19's are very susceptible to moisture contamination. Always keep them oiled and wrapped, and use latex gloves when handling them to prevent skin moisture from contaminating them.

Do you know why that is? Its inter-granular corrosion, lots of high strength steels are susceptible to this. It can start to rust on the outside, and propagate inward. I've seen metal sample that looked like a hollowed out rotten log from this. Pretty cool stuff.
 
Could someone please confirm if 60 ft lbs is enough torque for the mains?

Also, i have an analog and a digital dial indicators. Would it be better to use those, to get just the right stud stretch?
 
60 ft/lbs is correct for ARP main studs. Use moly lube and the 3-step process for those too.

Dial calipers are fine to measure stud lengths as long as you have a set accurate enough. I know I wouldn't trust mine to accurately measure up to .001" every time.

Thanks, onece again 99gst_racer

I actually meant using a travel dial indicator, like the one on the bore gauge, to measure stud stretch while torqueing the nuts(no way, i would trust a caliper ROFL). Isn't that a more superior way to get the proper torque?

I can see how that could be hard to do on the head studs, but for the mains and rod bolts, it is definetly more than doable. What do you guys think about that?
 
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